Results 51 to 60 of about 56,169 (259)

The NANOGrav 15 yr Dataset: Improved Timing Precision with Very Long Baseline Interferometry Astrometric Priors

The Astrophysical Journal
Accurate pulsar astrometric estimates are essential to almost all high-precision pulsar timing experiments. Traditional pulsar timing techniques refine these estimates by including them as free parameters when fitting a model to observed pulse time-of ...
Sofia V. Sosa Fiscella, Michael T. Lam, Gabriella Agazie, Akash Anumarlapudi, Anne M. Archibald, Zaven Arzoumanian, Paul T. Baker, Paul R. Brook, H. Thankful Cromartie, Kathryn Crowter, María Silvina De Biasi, Megan E. DeCesar, Paul B. Demorest, Timothy Dolch, Elizabeth C. Ferrara, William Fiore, Emmanuel Fonseca, Gabriel E. Freedman, Nate Garver-Daniels, Peter A. Gentile, Joseph Glaser, Deborah C. Good, Jeffrey S. Hazboun, Ross J. Jennings, Megan L. Jones, David L. Kaplan, Matthew Kerr, Duncan R. Lorimer, Jing Luo, Ryan S. Lynch, Alexander McEwen, Maura A. McLaughlin, Natasha McMann, Bradley W. Meyers, Cherry Ng, David J. Nice, Timothy T. Pennucci, Benetge B. P. Perera, Nihan S. Pol, Henri A. Radovan, Scott M. Ransom, Paul S. Ray, Ann Schmiedekamp, Carl Schmiedekamp, Brent J. Shapiro-Albert, Ingrid H. Stairs, Kevin Stovall, Abhimanyu Susobhanan, Joseph K. Swiggum, Haley M. Wahl   +49 more
doaj   +1 more source

Interactions between the Jet and Disk Wind in Nearby Radio-intermediate Quasar III Zw 2

The Astrophysical Journal, 2023
Disk winds and jets are ubiquitous in active galactic nuclei (AGN), and how these two components interact remains an open question. We study the radio properties of the radio-intermediate quasar III Zw 2.
Ailing Wang, Tao An, Shaoguang Guo, Prashanth Mohan, Wara Chamani, Willem A. Baan, Talvikki Hovatta, Heino Falcke, Tim J. Galvin, Natasha Hurley-Walker, Sumit Jaiswal, Anne Lahteenmaki, Baoqiang Lao, Weijia Lv, Merja Tornikoski, Yingkang Zhang   +15 more
doaj   +1 more source

Deep, ultra-high-resolution radio imaging of submillimetre galaxies using Very Long Baseline Interferometry [PDF]

, 2010
We present continent-scale VLBI - obtained with the European VLBI Network (EVN) at a wavelength of 18cm - of six distant, luminous submm-selected galaxies (SMGs).
A. D. Biggs, Alexander, Alexander, Appleton, Barnes, Baugh, Beelen, Biggs, Biggs, Blain, Blain, Blain, Capak, Carilli, Chapman, Chapman, Clements, Condon, Condon, Condon, Condon, Coppin, Coppin, Coppin, Coppin, Daddi, Davé, Di Matteo, Downes, Downes, Dunne, Dye, Eales, Ferrarese, Garrett, Gebhardt, Greve, Greve, Greve, Hernquist, Hildebrand, Hinshaw, Holland, Hopkins, Hopkins, Hopkins, Hopkins, Hopkins, Hopkins, Hopkins, Häring, Ibar, Ibar, Ibar, Ivison, Ivison, Ivison, Ivison, Ivison, Ivison, J. D. Younger, Kormendy, Kovács, Lacki, Lacki, Lacy, Laurent, Laurent, Lonsdale, Lonsdale, Lutz, Magorrian, Menéndez-Delmestre, Menéndez-Delmestre, Mihos, Mihos, Momjian, Momjian, Momjian, Momjian, Murphy, Narayanan, Narayanan, Narayanan, Novak, Page, Papadopoulos, Pope, R. J. Ivison, Robertson, Schinnerer, Scott, Scoville, Silk, Smail, Springel, Swinbank, Swinbank, Tacconi, Tacconi, Thompson, Tremaine, Valiante, Wang, Wang, Weingartner, Wright, Yang, Younger, Younger, Younger, Younger, Younger, Younger, Younger, Yun, Yun   +116 more
core   +1 more source

Modelling Very Long Baseline Interferometry (VLBI) observations

Journal of Geodesy and Geoinformation, 2012
Bu çalışmanın temel amacı Çok Uzun Baz Enterferometrisi VLBI sinyal gecikme modelinin teorik detaylarını Uluslararası Yer Dönüklük ve Referans Sistemleri Servisi IERS 2010 Konvansiyonları temelinde sunmaktır. Bu kapsamda sürekli parçalı lineer ofset CPWLO fonksiyonları ile gün‒içi zamansal çözünürlükte önceden belirlenmiş epoklarda, örneğin: Evrensel ...
Teke, K., Kayýkçi, E., Böhm, J., Schuh, H.   +3 more
openaire   +4 more sources

Milky Way scattering properties and intrinsic sizes of active galactic nuclei cores probed by very long baseline interferometry surveys of compact extragalactic radio sources [PDF]

, 2015
We have measured the angular sizes of radio cores of active galactic nuclei (AGN) and analyzed their sky distributions and frequency dependencies to study synchrotron opacity in AGN jets and the strength of angular broadening in the interstellar medium ...
A. Pushkarev, Y. Kovalev
semanticscholar   +1 more source

Resistance to Overdoping Allows Over 2000 S cm−1 Conductivity in P(g3BTTT) With Anion‐Exchange Doping

Advanced Materials, EarlyView.
Anion‐exchange doping of conjugated polymers is an effective way to achieve high conductivities. Here, we report over 2000 S cm−1 electrical conductivity for doped P(g3BTTT). In addition, we show that P(g3BTTT) sustains exceptionally high doping levels without any drop in the charge mobility.
Basil Hunger, Maximilian M. Horn, Eva Röck, Diego Rosas Villalva, Lize Bynens, Jochen Vanderspikken, Christina Kousseff, Silène Gobeil, Olivier Bardagot, Nesibe Akmanşen‐Kalayci, Sarah H. Tolbert, Iain McCulloch, Wouter Maes, Demetra Tsokkou, Natalie Banerji   +14 more
wiley   +1 more source

Serial MultiView: An Efficient Approach to Mitigating Atmospheric Spatial-structure Errors for Very-long-baseline-interferometry Astrometry

The Astronomical Journal
Atmospheric propagation errors are a main constraint on the accuracy of very-long-baseline-interferometry astrometry. For relative astrometry, differential techniques can mitigate these errors, but their effectiveness diminishes with decreasing elevation
Jingdong Zhang, Bo Zhang, Shuangjing Xu, Maria J. Rioja, Richard Dodson, Xiaofeng Mai, Oleg Titov   +6 more
doaj   +1 more source

Masses of Nearby Supermassive Black Holes with Very-Long Baseline Interferometry

, 2011
Dynamical mass measurements to date have allowed determinations of the mass M and the distance D of a number of nearby supermassive black holes. In the case of Sgr A*, these measurements are limited by a strong correlation between the mass and distance ...
Agol, Bendo, Bower, Broderick, Broderick, Broderick, Daniel P. Marrone, Dexter, Dimitrios Psaltis, Doeleman, Doeleman, Dolence, Eisenhauer, Falcke, Falcke, Feryal Özel, Fish, Fish, Ghez, Gillessen, Gültekin, Ho, Johannsen, Kardashev, Laor, Lee, Leeuw, Mościbrodzka, Pellegrini, Shcherbakov, Sheperd S. Doeleman, Stefan Gillessen, Takahashi, Tim Johannsen, Viergutz, Vincent L. Fish, Yuan, Özel   +37 more
core   +1 more source

Material Modification of Borofloat 33 During Scanning‐Based Microforming Using Femtosecond Laser Pulses

Advanced Optical Materials, EarlyView.
Possibilities for ablation‐free microforming of borosilicate glass using ultrashort laser pulses are presented. Depending on the laser parameters and scanning strategy, surface structures with profile heights of up to 20 µm could be produced. The work provides a comprehensive experimental and analytical characterization of the microforming process ...
Marina Skiba, Hagen Peter Kohl, Eric Schadow, Stefan Nolte, Andrés Fabián Lasagni, Jens Bliedtner   +5 more
wiley   +1 more source

Atmospheric Limitations for High-frequency Ground-based Very Long Baseline Interferometry

The Astrophysical Journal
Very long baseline interferometry (VLBI) provides the highest-resolution images in astronomy. The sharpest resolution is nominally achieved at the highest frequencies, but as the observing frequency increases, so too does the atmospheric contribution to ...
Dominic W. Pesce, Lindy Blackburn, Ryan Chaves, Sheperd S. Doeleman, Mark Freeman, Sara Issaoun, Michael D. Johnson, Greg Lindahl, Iniyan Natarajan, Scott N. Paine, Daniel C. M. Palumbo, Freek Roelofs, Paul Tiede   +12 more
doaj   +1 more source